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Problem
Pump output is low
Excessive paint leakage into throat
packing nut
Fluid is spitting from gun
Pump is difficult to prime
Clutch squeaks each time clutch
engages
High engine speed at no load
Gallon counter not working
No display, sprayer operates
310893J
Cause
Strainer (82) is clogged
Piston ball is not seating
Piston packings are worn or damaged
O-ring in pump is worn or damaged
Intake valve ball is not seating properly
Intake valve ball is packed with material
Engine speed is too low
Clutch is worn or damaged
Pressure setting is too low
Fluid filter (56), tip filter or tip is clogged or
dirty
Large pressure drop in hose with heavy
materials
Throat packing nut is loose
Throat packings are worn or damaged
Displacement rod is worn or damaged
Air in pump or hose
Tip is partially clogged
Fluid supply is low or empty
Air in pump or hose
Intake valve is leaking
Pump packings are worn
Paint is too thick
Engine speed is too high
Clutch surfaces are not matched to each other
when new and may cause noise
Misadjusted throttle setting
Worn engine governor
Bad sensor, broken or disconnected wire.
Displaced or missing magnet.
Display damaged or has bad connection
Solution
Clean strainer.
Service piston ball. Manual 310894.
Replace packings. Manual 310894.
Replace o-ring. Manual 310894.
Clean intake valve. Manual 310894.
Clean intake valve. Manual 310894.
Increase throttle setting. Manual 310892.
Adjust or replace clutch. Page 10.
Increase pressure. Manual 310892.
Clean filter. Manual 310892 or 309639.
Use larger diameter hose and/or reduce
overall length of hose. Use of more than
100 ft of 1/4 in. hose significantly reduces
performance of sprayer. Use 3/8 in. hose
for optimum performance (50 ft minimum).
Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leak-
age.
Replace packings. Manual 310894.
Replace rod. Manual 310894.
Check and tighten all fluid connections. Rep-
rime pump. Manual 310892.
Clear tip. Manual 309639.
Refill fluid supply. Prime pump. Manual
310892. Check fluid supply often to prevent
running pump dry.
Check and tighten all fluid connections.
Reduce engine speed and cycle pump as
slowly as possible during priming.
Clean intake valve. Be sure ball seat is not
nicked or worn and that ball seats well.
Reassemble valve.
Replace pump packings. Manual 310894.
Thin the paint according to the supplier's
recommendations
Decrease throttle setting before priming
pump. Manual 310892.
Clutch surfaces need to wear into each
other. Noise will dissipate after a day of run
time.
Reset throttle to 3300 engine rpm at no
load.
Replace or service engine governor
Check connections. Replace sensor or
wire. Reposition or replace magnet.
Check connections. Replace display.
Troubleshooting
7
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